Berlin 2012 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 13: Poster II
DF 13.26: Poster
Mittwoch, 28. März 2012, 15:00–17:30, Poster E
Impulsive stimulated Raman scattering on phonon-polaritons in oxides — •Jewgeni Goldshteyn1, Daniel Schick2, Andreas Paulke2, Peter Gaal2, and Matias Bargheer1,2 — 1Helmholtz Zentrum Berlin, Albert Einstein Str. 15, 12489 Berlin, Germany — 2Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
This contribution presents a time-resolved study of phonon-polariton dynamics in various materials like tetragonal LiNbO3 and quasi-cubic SrTiO3. We excite discrete modes by Impulsive Stimulated Raman Scattering (ISRS) using a k-selective transient grating technique. The excitation is probed by means of a second Raman scattering event, by detection of the four-wave-mixing signal in a box-car geometry. One virtue of our setup is the frequency-resolved detection of the scattered probe pulse, which allows for a measurement of stokes- and anti-stokes shifts of the probe light. The excitation process is presented thoroughly. In particular the transient atomic displacement and the sample symmetry are discussed. Further, we discuss implications on future ultrafast x-ray diffraction experiments to probe Raman excited modes.